Rotary tablet press and control method

Abstract

The invention provides a rotary tablet press and a control method, and relates to the technical field of tablet press equipment, the rotary tablet press comprises a rotary table, and the rotary table is provided with a mold; a filling device and a stamping device are arranged above the rotating table, and the filling device fills the mold with materials; the stamping device is used for pressing materials in the die; the stamping device is provided with a material supplementing device, and the material supplementing device is used for supplementing materials to the die before pressing. Most materials are filled into the die through the filling device, materials are supplemented into the die without the materials through the material supplementing device, the material supplementing process is executed when the stamping device moves downwards to be close to the die and does not make contact with the die, and equivalently, the material supplementing operation is achieved through the starting time of the stamping device; the rotating speed of the rotating table does not need to be slowed down, the product yield is improved, the starting time of the stamping device is utilized, it is guaranteed that materials in the die are sufficient during pressing, and the product quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tablet press equipment, and in particular to a rotary tablet press and a control method thereof. Background Art

[0002] In the pharmaceutical industry, tablet presses press drug powders or granules into tablets; tablet presses usually include the steps of feeding, filling, pressing and tableting. At present, tablet presses often encounter product quality problems in the pursuit of high output, especially when the turntable speed is too fast, which may lead to insufficient filling, affecting the weight and thickness of the tablets, and further affecting their quality and efficacy. Specifically: when the speed of the tablet press turntable increases, the filling time of each die hole decreases accordingly. If the filling time is not enough for the drug powder or granules to fully fill the die hole, it will lead to insufficient filling; especially when pressing large tablets, due to the large volume of the die hole, more drug powder or granules are needed to fill it, so the problem of insufficient filling is more obvious. Summary of the invention

[0003] The object of the present invention is to provide a rotary tablet press and a control method thereof, and the technical problem to be solved is how to ensure the filling amount in the die hole while pursuing high output.

[0004] The present invention is achieved through the following technical solutions: A first aspect provides a rotary tablet press, comprising a rotary table, wherein the rotary table is provided with a mold; A filling device and a punching device are arranged above the rotating table. The filling device fills the material into the mold; the punching device is used to press the material in the mold; The punching device is provided with a feeding device, and the feeding device is used to replenish materials to the mold before pressing.

[0005] Most of the material is filled into the mold through the filling device. For the mold with missing material, the material is supplemented into the mold through the filling device. The filling process is performed when the stamping device is moving downward close to the mold and is not in contact with the mold, which is equivalent to utilizing the start-up time of the stamping device to realize the filling operation; there is no need to slow down the rotation speed of the turntable, thereby increasing the product output, and utilizing the start-up time of the stamping device to ensure that there is sufficient material in the mold during pressing, thereby ensuring product quality.

[0006] Furthermore, the filling device comprises a hopper, a filling head, a filling pipe and a track, the two ends of the filling pipe are respectively connected to the hopper and the filling head, and the material is transported from the hopper to the filling head through the filling pipe; The filling head is arranged on a track, and the filling head moves above the mold along the track; When filling the material, the filling head rotates synchronously with the rotating table along the track, and the filling head faces the mold.

[0007] Through the track, the filling head is rotated synchronously with the rotating table, and the filling head is always facing the mold in the filling area, which prolongs the filling time and ensures the filling amount to a certain extent.

[0008] Furthermore, the filling head comprises a material preparation pipe, a material discharge pipe, an air pipe and an air pump, the input end of the material preparation pipe is connected to the output end of the filling pipe through a first valve, the output end of the material preparation pipe is connected to the input end of the material discharge pipe through a second valve, the input end of the air pipe is connected to the air pump, and the output end of the air pipe is connected to the material preparation pipe; When filling the material, open the second valve and the air pump.

[0009] The material in the material preparation pipe is ejected by the air pump to accelerate the filling speed of the material, thereby increasing the material filling amount; the material amount is prepared in advance by the material preparation pipe to prevent excessive material from entering the mold.

[0010] Furthermore, the material preparation pipe includes a first material preparation cavity and a second material preparation cavity, the first material preparation cavity and the second material preparation cavity are connected, and a third valve is provided at the connection between the first material preparation cavity and the second material preparation cavity; the first material preparation cavity is connected to the filling pipe through the first valve, and the first valve is normally open; the second material preparation cavity is connected to the discharge pipe through the second valve; When filling the material, open the second valve and the air pump, and close the third valve; When the filling of materials is finished, the second valve and the air pump are closed, and the third valve is opened.

[0011] Two preparation chambers are provided, and the first valve is normally open, so that the first preparation chamber can continuously prepare materials. Since the rotary table runs at a high speed, it is necessary to speed up the transfer of materials in the first preparation chamber to the second preparation chamber. Therefore, when the first preparation chamber and the second preparation chamber are connected, an air pump is used to spray air into the first preparation chamber, so that the material in the first preparation chamber is sprayed into the second preparation chamber, thereby speeding up the transfer speed.

[0012] Furthermore, the discharge pipe is provided with a material shielding piece; when filling the material, the output end of the discharge pipe extends into the cavity of the mold, and the material shielding piece contacts the upper surface of the mold to close the cavity of the mold.

[0013] In order to prevent material leakage, a material shielding sheet is set on the discharge pipe to ensure that the material is in a sealed environment when sprayed into the mold, thus solving the problem of material scattering.

[0014] Furthermore, the trachea includes a first branch trachea and a second branch trachea, the first branch trachea is connected to the first material preparation cavity, and a fourth valve is arranged on the first branch trachea; the second branch trachea is connected to the second material preparation cavity, and a fifth valve is arranged on the second branch trachea; When filling materials, close the fourth valve and open the fifth valve; When the filling of materials is finished, the fourth valve is opened and the fifth valve is closed.

[0015] Usually, the gas is sprayed alternately into the first preparation cavity and the second preparation cavity. When the gas is sprayed into the first preparation cavity, the gas flows to the second preparation cavity. Then, the gas is sprayed into the second preparation cavity again and the gas flows to the mold. When the material baffle plate leaves the mold, the gas leaks out of the mold, reducing the air pressure changes caused by the gas.

[0016] Furthermore, the above-mentioned feeding device includes a feeding pipe and a feeding head, the hopper and the feeding head are connected by the above-mentioned feeding pipe, and the above-mentioned feeding head is provided with a sixth valve; when replenishing materials, the sixth valve is opened.

[0017] A second aspect provides a control method for controlling the above-mentioned rotary tablet press; The control method comprises the following steps: Obtaining an operating area of ​​a rotary tablet press, dividing the operating area into a filling area, a feeding area, and a pressing area; When the mold enters the filling area, a filling instruction is generated; and the filling device fills the material into the mold based on the filling instruction; When the mold enters the material replenishment area, a material replenishment instruction and a punching instruction are generated, and the punching device moves downward toward the mold based on the punching instruction; and the material replenishment device replenishes material to the mold based on the material replenishment instruction; When the mold enters the pressing area, the punching device applies pressure to the material in the mold based on the punching instruction to produce a sheet.

[0018] Furthermore, before generating the above filling instruction, it is also necessary to determine whether there is material in the material preparation pipe. The specific steps include: Detect whether there is material in the first material preparation chamber; if not, open the first valve; if yes, then: Detect whether there is material in the second material preparation chamber; if not, open the third valve and the fourth valve; if yes, determine that there is material in the material preparation pipe; After determining that the material preparation pipe has material, determine whether to generate a filling instruction. The specific steps include: Obtaining the spatial coordinates of the filling head and the spatial coordinates of the mold to determine whether the filling head is facing the mold; When the filling head is facing the mold, a filling instruction and a moving instruction are generated; The filling head opens the second valve, the fifth valve and the air pump based on the filling instruction, and the filling head moves synchronously with the rotating table based on the movement instruction.

[0019] Check the material preparation status in real time and prepare materials in time to prevent the mold from not being filled due to material shortage.

[0020] Furthermore, the specific steps of generating the above-mentioned feeding instruction include: Obtaining the amount of material in the above mold to obtain the amount of collected material; The above-mentioned feeding device is equipped with a preset material quantity; Based on the above preset material quantity and collected material quantity, determine the material quantity to be replenished; Based on the amount of material to be replenished, a replenishment instruction is generated; The feeding device opens the sixth valve based on the feeding instruction.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: Most of the material is filled into the mold through the filling device. For the mold with missing material, the material is supplemented into the mold through the filling device. The filling process is performed when the stamping device is moving downward close to the mold and is not in contact with the mold, which is equivalent to utilizing the start-up time of the stamping device to realize the filling operation; there is no need to slow down the rotation speed of the turntable, thereby increasing the product output, and utilizing the start-up time of the stamping device to ensure that there is sufficient material in the mold during pressing, thereby ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 It is a structural schematic diagram of a rotary tablet press; Figure 2 It is a connection diagram of the filling device and the feeding device; Figure 3 This is the control flow chart of the rotary tablet press.

[0023] Marks and corresponding parts names in the attached drawings: 1. Rotating table; 2. Mould; 3. Punching device; 4. Filling device; 41. Track; 42. Filling head; 421. First material preparation chamber; 422. Second material preparation chamber; 423. Discharging pipe; 424. Air pump; 425. First branch air pipe; 426. Second branch air pipe; 427. Air pipe; 428. Material shielding sheet; 43. Hopper; 44. Filling pipe; 5. Feeding device; 51. Feeding pipe; 52. Feeding head; 61. First valve; 62. Second valve; 63. Third valve; 64. Fourth valve; 65. Fifth valve; 66. Sixth valve. DETAILED DESCRIPTION

[0024] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0025] First embodiment: a rotary tablet press, combined with Figure 1 , comprising a rotating table 1, with the central axis of the rotating table 1 as the center, the operation area of ​​the tablet press is divided into a filling area, a feeding area and a pressing area; the rotating table 1 is provided with a plurality of molds 2, the plurality of molds 2 can be interconnected to form a whole, or can exist separately; each mold 2 is provided with a chamber, the chamber is used to contain materials, and the materials can be powder or granules; A filling device 4 and a punching device 3 are arranged above the rotating table 1. The filling device 4 is arranged in the filling area, and the filling device 4 fills the material into the mold 2; the punching device 3 is arranged on the rotating table 1, and the rotating table 1 drives the punching device 3 to rotate. The mold 2 corresponds to the punching device 3 one by one, and the punching device 3 is used to press the material in the mold 2 to ensure that each product can achieve the expected shape.

[0026] A feeding device 5 is provided beside the punching device 3, and the feeding device 5 is used to feed materials to the mold 2 before pressing. The feeding device 5 reduces the defective rate caused by insufficient material filling, thereby improving the qualified rate and overall quality of the product.

[0027] Most of the material is filled into the mold 2 through the filling device 4. For the mold 2 with missing material, the material is supplemented into the mold 2 through the filling device 5. The filling process is performed when the punching device 3 moves downward close to the mold 2 and does not contact the mold 2, which is equivalent to utilizing the starting time of the punching device 3 to realize the filling operation; there is no need to slow down the rotation speed of the turntable 1, thereby increasing the product output, and utilizing the starting time of the punching device 3 to ensure that there is sufficient material in the mold 2 during pressing, thereby ensuring product quality.

[0028] Second embodiment: Based on the first embodiment, Figure 2 The filling device 4 includes a hopper 43, a filling head 42, a filling pipe 44 and a track 41. The two ends of the filling pipe 44 are respectively connected to the hopper 43 and the filling head 42, and the material is transported from the hopper 43 to the filling head 42 through the filling pipe 44; the hopper 43 serves as a storage and supply source of the material, and is connected to the filling head 42 through the filling pipe 44, forming a continuous material conveying channel.

[0029] The filling head 42 is arranged on the track 41, and the track 41 can be arranged around the rotation center of the rotating table 1. In the filling area, the filling head 42 is always located directly above the mold 2 when it runs synchronously with the rotating table 1 on the track 41, and the filling head 42 moves above the mold 2 along the track 41; when filling materials, the filling head 42 rotates synchronously with the rotating table 1 along the track 41, and the filling head 42 faces the mold 2. This means that during the rotation of the rotating table 1, the filling head 42 always faces the mold 2, and the material can be accurately filled when each mold 2 passes by. This synchronization prolongs the filling time to a certain extent and ensures the filling amount.

[0030] In order to enable the filling head 42 to automatically rotate along the track 41 and follow the rotating table 1, a driving wheel is provided on the filling head 42, and the driving wheel is connected to a driver, and the driving wheel is driven to rotate by the driver to achieve movement (the driving wheel and the driver can use existing equipment and procedures, and the present invention will not repeat them); since the filling head 42 can automatically move along the track 41 and rotate synchronously with the rotating table 1, the filling process can be completed without human intervention, which not only improves the filling efficiency, but also reduces the risk of uneven filling or insufficient filling caused by improper human operation. By adjusting the parameters of the filling tube 44, the filling head 42 and the track 41, the filling amount and filling speed of the material can be controlled, which helps to maintain the consistency of the material in each mold 2, thereby improving the quality and qualified rate of the product.

[0031] The filling head 42, filling tube 44 and track 41 can be adjusted according to the production requirements of different products and the specifications of the mold 2, so that the rotary tablet press can be suitable for a variety of different production scenarios and product types, thereby improving the flexibility and adaptability of the equipment; the filling device 4 is easy to disassemble and clean, which helps to maintain the hygiene and cleanliness of the equipment and prevent material contamination and cross contamination.

[0032] Third embodiment: Based on the second embodiment, Figure 2 The filling head 42 comprises a material preparation pipe, a material discharge pipe 423, an air pipe 427 and an air pump 424. The input end of the material preparation pipe is connected to the output end of the filling pipe 44 via a first valve 61, the output end of the material preparation pipe is connected to the input end of the material discharge pipe 423 via a second valve 62, the input end of the air pipe 427 is connected to the air pump 424, and the output end of the air pipe 427 is connected to the material preparation pipe; When filling the material, the second valve 62 and the air pump 424 are opened.

[0033] The material in the material preparation pipe is ejected through the air pump 424 to accelerate the filling speed of the material, thereby increasing the material filling amount; the material amount is prepared in advance through the material preparation pipe to prevent excessive material from entering the mold 2.

[0034] Working process: The material preparation pipe is used as a temporary storage area for materials and is connected to the discharge pipe 423 through the second valve 62. When filling the material, the second valve 62 is opened, and the material enters the discharge pipe 423 from the material preparation pipe and is finally filled into the hole of the mold 2. The air pump 424 provides a certain pressure for the material in the material preparation pipe, helping the material to enter the discharge pipe 423 more smoothly and maintain a certain degree of tightness during the filling process, which not only improves the filling speed, but also helps to reduce the loss and waste of the material during the filling process. The pressure of the air pump 424 can be adjusted according to the properties of the material and the filling requirements. For materials with different densities and fluidities, filling control can be achieved by adjusting the pressure of the air pump 424, so that the rotary tablet press can be suitable for a variety of different material types and production requirements, improving the flexibility and adaptability of the equipment.

[0035] In a specific embodiment, the material preparation pipe includes a first material preparation cavity 421 and a second material preparation cavity 422, the first material preparation cavity 421 and the second material preparation cavity 422 are connected, and a third valve 63 is provided at the connection between the first material preparation cavity 421 and the second material preparation cavity 422; the first material preparation cavity 421 is connected to the filling pipe 44 through the first valve 61, and the first valve 61 is normally open; the second material preparation cavity 422 is connected to the discharge pipe 423 through the second valve 62; When filling the material, the second valve 62 and the air pump 424 are opened, and the third valve 63 is closed; When the filling of materials is finished, the second valve 62 and the air pump 424 are closed, and the third valve 63 is opened.

[0036] Two preparation chambers are provided, and the first valve 61 is normally open, so that the first preparation chamber 421 can continuously prepare materials. Since the rotating table 1 runs at a high speed, it is necessary to accelerate the transfer speed of the material in the first preparation chamber 421 to the second preparation chamber 422. Therefore, when the first preparation chamber 421 and the second preparation chamber 422 are connected, the air pump 424 is used to spray air into the first preparation chamber 421, so that the material in the first preparation chamber 421 is sprayed into the second preparation chamber 422, thereby accelerating the transfer speed.

[0037] Filling process: (1) Filling preparation stage: The first valve 61 is always open to ensure that the material can continuously enter the first preparation chamber 421 from the filling pipe 44; the third valve 63 is closed to prevent the material from flowing freely between the first preparation chamber 421 and the second preparation chamber 422, thereby maintaining the independence of the two chambers; the second valve 62 is closed to prevent the material from entering the discharge pipe 423 in advance.

[0038] (2) Filling stage: When the rotating table 1 brings the mold 2 hole to the bottom of the filling head 42, the second valve 62 opens, allowing the material to enter the mold 2 hole from the second preparation chamber 422 through the discharge pipe 423; at the same time, the air pump 424 is turned on to provide pressure for the material in the second preparation chamber 422 (and possible second preparation chamber 422, depending on the connection position of the air pipe 427), helping the material to enter the discharge pipe 423 more smoothly; the third valve 63 remains closed to ensure that the material does not flow back from the second preparation chamber 422 to the first preparation chamber 421 during the filling process.

[0039] (3) End of filling stage: When the hole 2 of the mold is filled or the predetermined filling time is reached, the second valve 62 is closed to stop the material from being transported to the hole 2 of the mold; at the same time, the air pump 424 is closed to stop providing pressure to the material; the third valve 63 is opened to allow the material in the first preparation cavity 421 to enter the second preparation cavity 422 to prepare for the next filling.

[0040] In a specific embodiment, the discharge pipe 423 is provided with a material shielding piece 428 ; when filling the material, the output end of the discharge pipe 423 extends into the cavity of the mold 2 , and the material shielding piece 428 contacts the upper surface of the mold 2 to close the cavity of the mold 2 .

[0041] To prevent material leakage, a material shielding sheet 428 is provided at the discharge pipe 423 so that the material is in a sealed environment when sprayed into the mold 2, ensuring that the material will not overflow or leak from the cavity of the mold 2 during the filling process, while ensuring that the material can be filled into the cavity of the mold 2.

[0042] In a specific embodiment, the air pipe 427 includes a first branch air pipe 425 and a second branch air pipe 426. The first branch air pipe 425 is connected to the first material preparation chamber 421, and a fourth valve 64 is provided on the first branch air pipe 425; the second branch air pipe 426 is connected to the second material preparation chamber 422, and a fifth valve 65 is provided on the second branch air pipe 426. When filling the material, the fourth valve 64 is closed and the fifth valve 65 is opened; When the filling of materials is finished, the fourth valve 64 is opened and the fifth valve 65 is closed.

[0043] Usually, the gas is sprayed alternately into the first preparation cavity 421 and the second preparation cavity 422. When the gas is sprayed into the first preparation cavity 421, the gas flows to the second preparation cavity 422. Then, the gas is sprayed into the second preparation cavity 422 again, and the gas flows to the mold 2. When the material baffle plate leaves the mold 2, the gas leaks out from the mold 2, reducing the air pressure change caused by the gas.

[0044] Fourth embodiment: Based on any of the above embodiments, Figure 2The feeding device 5 includes a feeding pipe 51 and a feeding head 52. The hopper 43 and the feeding head 52 are connected through the feeding pipe 51. The feeding head 52 is provided with a sixth valve 66. When replenishing materials, the sixth valve 66 is opened.

[0045] The feed head 52 is composed of a vertical pipe and an inclined pipe. Figure 1 , the vertical tube and the oblique tube are connected; the vertical tube is connected to the feeding tube 51, and the vertical tube extends toward the mold 2; the output end of the oblique tube extends out of the working end of the stamping device 3, and the output end of the oblique tube extends toward the central axis of the stamping device 3; an oblique plate is also provided on the vertical tube, and a groove is provided on the lower surface of the oblique plate, and the oblique plate extends away from the central axis of the stamping device 3, and an oblique column engaged with the groove of the oblique plate is provided on the side of the mold 2. When the stamping device 3 moves downward, the oblique column and the oblique plate gradually approach each other, and then abut against each other, and the stamping device 3 continues to move downward, and the feeding head 52 is expanded to the side through the oblique column and the oblique plate. At this time, the oblique tube leaves the working end of the stamping device 3, avoiding the oblique tube from hindering the pressing operation; in order to enable the feeding head 52 to expand to the side smoothly, the feeding device 5 can be connected to the stamping device 3 by an elastic member, and the elastic member can be an elastic rubber.

[0046] Fifth embodiment: A control method for controlling the above rotary tablet press; Figure 3 , The control method comprises the following steps: Obtaining an operating area of ​​a rotary tablet press, dividing the operating area into a filling area, a feeding area, and a pressing area; When the mold 2 enters the filling area, a filling instruction is generated; the filling device 4 fills the material into the mold 2 based on the filling instruction; When the mold 2 enters the material replenishment area, a material replenishment instruction and a punching instruction are generated, and the punching device 3 moves downward toward the mold 2 based on the punching instruction; the material replenishment device 5 replenishes material to the mold 2 based on the material replenishment instruction; When the mold 2 enters the pressing area, the punching device 3 applies pressure to the material in the mold 2 based on the punching instruction to produce a sheet.

[0047] By dividing the working area and generating corresponding control instructions, materials can be filled, supplemented and pressed at the correct position, thereby improving the production efficiency of the tablet press and the quality of the tablets. At the same time, this control method is also flexible and scalable, and can be adjusted and optimized according to different production requirements and material characteristics.

[0048] In a specific embodiment, before generating the above filling instruction, it is also necessary to determine whether there is material in the material preparation pipe, and the specific steps include: Detect whether there is material in the first material preparation chamber 421; if not, open the first valve 61; if yes, then: Detect whether there is material in the second material preparation chamber 422; if not, open the third valve 63 and the fourth valve 64; if yes, determine that there is material in the material preparation pipe; After determining that the material preparation pipe has material, determine whether to generate a filling instruction. The specific steps include: Obtain the spatial coordinates of the filling head 42 and the spatial coordinates of the mold 2 to determine whether the filling head 42 is facing the mold 2; When the filling head 42 is facing the mold 2, a filling instruction and a moving instruction are generated; The filling head 42 opens the second valve 62 , the fifth valve 65 and the air pump 424 based on the filling instruction, and the filling head 42 moves synchronously with the rotating table 1 based on the moving instruction.

[0049] Detect the material preparation status in real time and prepare materials in time to prevent the situation where mold 2 is not filled due to material shortage.

[0050] In a specific embodiment, the specific steps of generating the above-mentioned feeding instruction include: Obtain the amount of material in the mold 2 to obtain the amount of collected material; The above-mentioned feeding device 5 is configured with a preset material amount; Based on the difference between the preset material quantity and the collected material quantity, determine the amount of material to be replenished; Based on the amount of material to be replenished, a replenishment instruction is generated; The feeding device 5 opens the sixth valve 66 based on the feeding instruction.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotary tablet press, characterized in that: It comprises a rotating table (1), wherein the rotating table (1) is provided with a mold (2); A filling device (4) and a punching device (3) are arranged above the rotating table (1); the filling device (4) is used to fill the material into the mold (2); and the punching device (3) is used to press the material in the mold (2); The punching device (3) is provided with a material replenishing device (5), and the material replenishing device (5) is used to replenish material to the mold (2) before pressing.

2. The rotary tablet press according to claim 1, characterized in that: The filling device (4) comprises a hopper (43), a filling head (42), a filling pipe (44) and a track (41); two ends of the filling pipe (44) are respectively connected to the hopper (43) and the filling head (42); materials are transported from the hopper (43) to the filling head (42) through the filling pipe (44); The filling head (42) is arranged on the track (41), and the filling head (42) moves along the track (41) above the mold (2); When filling the material, the filling head (42) rotates synchronously with the rotating table (1) along the track (41), and the filling head (42) faces the mold (2).

3. The rotary tablet press according to claim 2, characterized in that: The filling head (42) comprises a material preparation pipe, a material discharge pipe (423), an air pipe (427) and an air pump (424); the input end of the material preparation pipe is connected to the output end of the filling pipe (44) via a first valve (61); the output end of the material preparation pipe is connected to the input end of the material discharge pipe (423) via a second valve (62); the input end of the air pipe (427) is connected to the air pump (424); and the output end of the air pipe (427) is in communication with the material preparation pipe; When filling the material, the second valve (62) and the air pump (424) are opened.

4. The rotary tablet press according to claim 3, characterized in that: The material preparation pipe comprises a first material preparation chamber (421) and a second material preparation chamber (422), the first material preparation chamber (421) and the second material preparation chamber (422) being connected, and a third valve (63) is provided at the connection between the first material preparation chamber (421) and the second material preparation chamber (422); the first material preparation chamber (421) is connected to the filling pipe (44) via the first valve (61), and the first valve (61) is normally open; the second material preparation chamber (422) is connected to the discharge pipe (423) via the second valve (62); When filling the material, the second valve (62) and the air pump (424) are opened, and the third valve (63) is closed; When the filling of materials is completed, the second valve (62) and the air pump (424) are closed, and the third valve (63) is opened.

5. The rotary tablet press according to claim 4, characterized in that: The discharge pipe (423) is provided with a material shielding sheet (428); when filling the material, the output end of the discharge pipe (423) extends into the cavity of the mold (2), and the material shielding sheet (428) contacts the upper surface of the mold (2), thereby closing the cavity of the mold (2).

6. The rotary tablet press according to claim 4, characterized in that: The air pipe (427) comprises a first branch air pipe (425) and a second branch air pipe (426); the first branch air pipe (425) is connected to the first material preparation chamber (421), and a fourth valve (64) is provided on the first branch air pipe (425); the second branch air pipe (426) is connected to the second material preparation chamber (422), and a fifth valve (65) is provided on the second branch air pipe (426); When filling the material, the fourth valve (64) is closed and the fifth valve (65) is opened; When the filling of materials is completed, the fourth valve (64) is opened and the fifth valve (65) is closed.

7. The rotary tablet press according to claim 2, characterized in that: The feeding device (5) comprises a feeding pipe (51) and a feeding head (52), the feeding pipe (51) connecting the hopper (43) and the feeding head (52), and the feeding head (52) is provided with a sixth valve (66); when replenishing materials, the sixth valve (66) is opened.

8. A control method, characterized in that: The control method is used to control the rotary tablet press according to any one of claims 1 to 7; The control method comprises the following steps: Obtaining an operating area of ​​a rotary tablet press, dividing the operating area into a filling area, a feeding area, and a pressing area; When the mold enters the filling area, a filling instruction is generated; and the filling device fills the material into the mold based on the filling instruction; When the mold enters the material replenishment area, a material replenishment instruction and a punching instruction are generated, and the punching device moves downward toward the mold based on the punching instruction; and the material replenishment device replenishes material to the mold based on the material replenishment instruction; When the mold enters the pressing area, the punching device applies pressure to the material in the mold based on the punching instruction to produce a sheet.

9. The control method according to claim 8, characterized in that: Before generating the filling instruction, it is also necessary to determine whether there is material in the material preparation pipe. The specific steps include: Check whether there is material in the first preparation chamber; if not, open the first valve; if yes, then: Detect whether there is material in the second material preparation chamber; if not, open the third valve and the fourth valve; if yes, determine that there is material in the material preparation pipe; After confirming that there is material in the preparation pipe, determine whether to generate a filling instruction. The specific steps include: Acquire the spatial coordinates of the filling head and the spatial coordinates of the mold to determine whether the filling head is facing the mold; When the filling head faces the mold, a filling instruction and a moving instruction are generated; The filling head opens the second valve, the fifth valve and the air pump based on the filling instruction, and the filling head moves synchronously with the rotating table based on the movement instruction.

10. The control method according to claim 8, characterized in that: The specific steps of generating the feeding instruction include: Obtaining the amount of material in the mold to obtain the amount of collected material; The feeding device is configured with a preset material amount; Determining the amount of material to be replenished based on the preset material amount and the collected material amount; Based on the amount of material to be replenished, generating a replenishment instruction; The feeding device opens the sixth valve based on the feeding instruction.

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